Mega Code Archive
Utility methods for handling streams
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//The contents of this file are subject to the Mozilla Public License Version 1.1
//(the "License"); you may not use this file except in compliance with the
//License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
//
//Software distributed under the License is distributed on an "AS IS" basis,
//WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
//for the specific language governing rights and
//limitations under the License.
//
//The Original Code is "The Columba Project"
//
//The Initial Developers of the Original Code are Frederik Dietz and Timo Stich.
//Portions created by Frederik Dietz and Timo Stich are Copyright (C) 2003.
//
//All Rights Reserved.
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Contains utility methods for handling streams.
*/
public class StreamUtils {
private static final int BUFFERSIZE = 8000;
/**
* Copies length bytes from an InputStream to an OutputStream.
*
* @param in
* InputStream from wihch the bytes are to copied.
* @param out
* OutputStream in which the bytes are copied.
* @param length
* The number of bytes to copy
* @return Number of bytes which are copied.
* @throws IOException
* If the streams are unavailable.
*/
public static int streamCopy(InputStream in, OutputStream out, int length)
throws IOException {
byte[] buffer = new byte[BUFFERSIZE];
int read;
int copied = 0;
while ((read = in
.read(buffer, 0, Math.min(BUFFERSIZE, length - copied))) > 0) {
out.write(buffer, 0, read);
copied += read;
}
return copied;
}
/**
* Copies all bytes from an InputStream to an OutputStream. The buffer size
* is set to 8000 bytes.
*
* @param _isInput
* InputStream from wihch the bytes are to copied.
* @param _osOutput
* OutputStream in which the bytes are copied.
* @return Number of bytes which are copied.
* @throws IOException
* If the Streams are unavailable.
*/
public static long streamCopy(InputStream in, OutputStream out)
throws IOException {
byte[] buffer = new byte[BUFFERSIZE];
int read;
long copied = 0;
while ((read = in.read(buffer)) > 0) {
out.write(buffer, 0, read);
copied += read;
}
return copied;
}
/**
* Reads a InputStream of chars into a StringBuffer.
*
* @param in
* the InputStream to read from
* @return the interpreted InputStream
* @throws IOException
*/
public static StringBuffer readCharacterStream(InputStream in)
throws IOException {
StringBuffer result = new StringBuffer(in.available());
int read = in.read();
while (read > 0) {
result.append((char) read);
read = in.read();
}
in.close();
return result;
}
public static byte[] readInByteArray(InputStream in) throws IOException {
byte[] result = new byte[in.available()];
in.read(result);
in.close();
return result;
}
/**
* Copies all bytes from the given InputStream into an internal
* ByteArrayOutputStream and returnes a new InputStream with all bytes from
* the ByteArrayOutputStream. The data are real copied so this method
* "clones" the given Inputstream and returns a new InputStream with same
* data.
*
* @param from
* InputStream from which all data are to copy
* @return a new InputStream with all data from the given InputStream
* @throws IOException
*/
public static InputStream streamClone(InputStream from) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
streamCopy(from, out);
return new ByteArrayInputStream(out.toByteArray());
}
}
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